temperature_converter_GUI.py

__author__ = 'Avinash'

import tkinter as tk
from functools import partial

# global variable
tempVal = "Celsius"


# getting drop down value
def store_temp(sel_temp):
    global tempVal
    tempVal = sel_temp


# the main conversion
def call_convert(rlabel1, rlabe12, inputn):
    tem = inputn.get()
    if tempVal == 'Celsius':
        f = float((float(tem) * 9 / 5) + 32)
        k = float((float(tem) + 273.15))
        rlabel1.config(text="%f Fahrenheit" % f)
        rlabe12.config(text="%f Kelvin" % k)
    if tempVal == 'Fahrenheit':
        c = float((float(tem) - 32) * 5 / 9)
        k = c + 273
        rlabel1.config(text="%f Celsius" % c)
        rlabe12.config(text="%f Kelvin" % k)
    if tempVal == 'Kelvin':
        c = float((float(tem) - 273.15))
        f = float((float(tem) - 273.15) * 1.8000 + 32.00)
        rlabel1.config(text="%f Celsius" % c)
        rlabe12.config(text="%f Fahrenheit" % f)
    return


# app window configuration and UI
root = tk.Tk()
root.geometry('400x150+100+200')
root.title('Temperature Converter')
root.configure(background='#09A3BA')
root.resizable(width=False, height=False)
root.grid_columnconfigure(1, weight=1)
root.grid_rowconfigure(0, weight=1)

numberInput = tk.StringVar()
var = tk.StringVar()

# label and entry field
input_label = tk.Label(root, text="Enter temperature", background='#09A3BA', foreground="#FFFFFF")
input_entry = tk.Entry(root, textvariable=numberInput)
input_label.grid(row=1)
input_entry.grid(row=1, column=1)

# result label's for showing the other two temperatures
result_label1 = tk.Label(root, background='#09A3BA', foreground="#FFFFFF")
result_label1.grid(row=3, columnspan=4)
result_label2 = tk.Label(root, background='#09A3BA', foreground="#FFFFFF")
result_label2.grid(row=4, columnspan=4)

# drop down initalization and setup
dropDownList = ["Celsius", "Fahrenheit", "Kelvin"]
dropdown = tk.OptionMenu(root, var, *dropDownList, command=store_temp)
var.set(dropDownList[0])
dropdown.grid(row=1, column=3)
dropdown.config(background='#09A3BA', foreground="#FFFFFF")
dropdown["menu"].config(background='#09A3BA', foreground="#FFFFFF")

# button click
call_convert = partial(call_convert, result_label1, result_label2, numberInput)
result_button = tk.Button(root, text="Convert", command=call_convert, background='#09A3BA', foreground="#FFFFFF")
result_button.grid(row=2, columnspan=4)

root.mainloop()